Tjahjono, A., Pramesti, F.G., Frendyta, N.S. and Paristiawan, P.A. 2024. Increased Hardness Value of Medium Manganese Steel Through Double Tempering, Hot Rolling, and Variation of Cooling Media. JURNAL ILMU FISIKA. 16, 1 (Feb. 2024), 79–87. DOI:https://doi.org/10.25077/jif.16.1.79-87.2024.